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Improved high protection sunscreen composition

A technology of composition and sunscreen, applied in skin care preparations, medical preparations containing active ingredients, cosmetics, etc., can solve the problems of reducing the protective effect of the composition and easily losing the anti-ultraviolet effect

Inactive Publication Date: 2015-05-27
RIEMANN TRADING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one of the disadvantages of traditional oil-in-water emulsions is that they very easily lose their UV protection efficacy once they come into contact with water; , the sunscreens contained in the aqueous phase are removed by the water and thus greatly reduce the overall photoprotective efficacy of these compositions

Method used

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  • Improved high protection sunscreen composition
  • Improved high protection sunscreen composition
  • Improved high protection sunscreen composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1 - Sunscreen composition and its preparation

[0068] Sunscreen compositions were prepared according to the tables for compositions A and B shown below.

[0069] Table 1: Sunscreen Composition A (reduced amount of film former)

[0070]

[0071]

[0072] Table 2: Sunscreen Composition A (reduced amount of film former)

[0073]

[0074]

[0075] The compositions were prepared by adding the listed ingredients in the order listed under agitation using a Silverson L4RT high shear mixer. Stirring time between addition of ingredients can vary from 1-25 min. No heating of the solution was performed. The temperature of the mixture is always between 20°C and 40°C.

Embodiment 2

[0076] Example 2 - Water resistance of sunscreen compositions

[0077] The effect of a reduced amount of film-forming polymer on the water resistance of the compositions of the invention was measured in vivo. Sunscreen compositions A and B were prepared according to Example 1 and subjected to in vivo SPF determinations according to the Guidelines for Evaluating Sun Product Water Resistance (COLIPA 2005). The test was performed by the Institute Dr. Schrader Hautphysilogie, Holzminden, Germany.

[0078] As stated, wet SPF for the in vivo test is the SPF value measured after applying the sunscreen and then immersing the subject in water for 80 minutes. The 80 min immersion in water was divided into four 20 min immersions and a 15 min drying time in air before the first immersion, between immersions and after the fourth immersion.

[0079] The very water resistance value (percentage) is calculated as follows:

[0080] VWR=100×SPF w / SPF s

[0081] where the lower limit of ...

Embodiment 3

[0086] Example 3 - UVA Protection and Boots Star Rating of Sunscreen Compositions

[0087] Protection against UVA radiation can be determined by the COLIPA ratios specified in the COLIPA guidelines (In vitro method for determining UVA protection factors and "critical wavelength" values ​​for sunscreen products, Guideline, COLIPA, March 2011). The COLIPA ratio is calculated as follows:

[0088] COLIPA ratio = SPF 标签 / UVA-PF

[0089]where UVA-PF is the actual "SPF" obtained for UVA radiation tested in vitro according to the guidelines. Compositions A and B of the present invention were tested and showed COLIPA ratios of 1.6 and 1.7 respectively, which fulfills the recommendation from COLIPA for ratios below 3.

[0090] UVA protection was also determined by the Boots star rating system (UVA:UVB ratio test according to the Boots star rating system [revised 2001]; Boots company PLC, Nottingham NG23AA, UK, September 2011), which is based on exposing the samples to Ratio betwee...

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Abstract

Thus, one aspect of the invention relates to a sunscreen composition comprising at least one sunscreen agent, at least one film forming polymer, and at least one solvent, wherein said film forming polymer is present in an amount of less than 2.0 %(w / w). Another aspect of the present invention relates to a process for the manufacture of a sunscreen composition comprising the steps of i) providing at least one solvent, at least one film forming polymer in an amount of less than 2.0 %(w / w), and at least one sunscreen agent, ii) admixing the components of step i) to provide a sunscreen composition.

Description

technical field [0001] The present invention relates to sunscreen compositions. In particular, the present invention relates to sunscreen compositions having reduced amounts of film-forming polymers and high water resistance. Background technique [0002] It is an established fact that UV radiation causes skin burns, loss of skin elasticity and appearance of wrinkles, promoting premature skin aging. Furthermore, UV radiation promotes the initiation of, or in some individuals exacerbates, the erythematous reaction and may even be a source of phototoxic or photoallergic reactions. Last, but not least, UV radiation has carcinogenic effects. For these reasons, there is a continuing need for methods for protecting the skin from the adverse effects of UV radiation. [0003] There are many requirements for skin compositions for photoprotection of human skin: the compositions preferably have a pleasant feel and are formulated as easy-to-use non-greasy sprays, emulsions and creams...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/34A61Q17/04A61K8/81
CPCA61K8/34A61Q17/04A61K8/8158A61K2800/31A61K8/8152A61K8/8182A61K8/046A61K8/37A61K8/8176A61K2800/48
Inventor 琳恩·布里策
Owner RIEMANN TRADING